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Abstract

U.S. Patent 4,025,186 describes a belt-type electrophotographic copier wherein two tracks of indicia are disposed along one edge of the belt. One of the tracks is a low frequency track which is utilized to identify the panel wherein images are placed. The other track is a high frequency track which is utilized to generate electrical signals for activating the processing station which performs on the image area of the belt.

Country

United States

Language

English (United States)

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Page 1 of 3

Apparatus for Generating Timing Signal for a Belt Type Copier

U.S. Patent 4,025,186 describes a belt-type electrophotographic copier
wherein two tracks of indicia are disposed along one edge of the belt. One of the
tracks is a low frequency track which is utilized to identify the panel wherein
images are placed. The other track is a high frequency track which is utilized to
generate electrical signals for activating the processing station which performs on
the image area of the belt.

This article describes a belt-type electrophotographic copier wherein a single
track of indicia is utilized to identify image panels and to generate electrical
signals for activating stations which perform on the image area of the belt. The
indicia on the common track which is utilized to identify the image panels has a
larger area than the indicia used to activate the processing stations.

Fig. 1 shows the photoconductor 10 with a single timing track disposed on
one edge of the photoconductor. The timing track includes a plurality of high
frequency indicia 12 and a plurality of low frequency indicia 14. The wider indicia
is used to identify the panel areas where an image is to be placed on the
photoconductor, while the high frequency mark generates the signal which is
used to activate the various processing stations which operate within the image
area of the photoconductor. A single sensor is used to produce a pulse having a
width proportional to the width of each mark on the belt. The machine control
logic (either software or hardware) samples the sensor output at a high frequency
(relative to the pulse) to perform a pulse-width measurement on each pulse. The
control logic then determines whether the sensed mark is a short timing mark or
a longer image panel mark based upon the resulting pulse width measurement.
The panel marking signal is utilized by the system to determine where the image
goes while the high frequency timing mark is utilized by the system to activate
the necessary processing station.

Fig. 2 shows a block diagram of a hardware implementation of the detection
circuitry. Fig. 3 shows the waveforms which are generated by Fig. 2 at various
sections of the circuitry. The sensor package 70 (Fig. 2) is mounted relative to
the single track of indicia shown on the photoconductor of Fig. 1.

The analog signal which is generated from the sensor is shaped into a
square signal 110 by squaring circuit 10. The square sign...